Bolt-extractor.



J. A. MAGNUSSON.

BOLT EXTRAOTOR.

APPLIOATION FILED 00T. '1, 1911.

v 1,019,718. Patented Mar.5, 1912.

z SHEETS-SHEET 2. 3

UNITED STATES PATENT OFFICE.

JOHN A. MAGNUSSON, OF TACOMA, WASHINGTON, ASSIGNOR 0F ONE-HALF TO PETERR. TANZY, 0F TACOMA, WASHINGTON.

BOLT-EXTRACTOR.

Specication of Letters Patent.

Patented Mar. 5, 1912.

To all whom it may concern:

Be it known that I, JOHN A. MAcNUssoN, a citizen of the United States,residing at Tacoma, in the county of Pierce and State of Washington,have invented a new and useful Improvement in Bolt-Extractors, of whichthe following is a specication.

This invention relates to devices for drawing bolts outl of engineframes, and other similar uses, and has for its object to provide amechanism which has great power and which can be applied in very limitedspace such as is commonly encountered in the work in locomotive repairshops.

Further objects are to provide devices for reducing the wear on the jackplunger and to prevent the entrance of air past the piston and also toprovide a mechanism which will firmly grip the bolt head, or otherobject to be drawn, and which will tighten its grip thereon under thestrain of drawing the bolt, and to provide a mechanism which will fit alarge number of sizes of bolt heads without alteration.

I attain these and other objects by the devices, mechanisms, andarrangements illustrated in the accompanying drawings, in which- Figure1 is a front elevation of the eX- tractor in use; Fig. 2 is a horizontalsection thereof, showing the tie bar broken away to reveal the lower endof the device; Fig. 3 is a vertical section of the jack cylinder bywhich the power is applied to the bolt eX- tractor; Fig. 4 is a verticalsection of the operating cylinder showing the plunger therein inelevation; and Fig. 5 is a side elevation of the jack showing the outerend thereof in section.

Similar numerals of reference refer to similar parts throughout theseveral views.

The bolt puller comprises a pair of side bars 1, having gripping jaws 2at their lower ends, said jaws being preferably serrated and beingremovably secured to the bars 1 by means of screws 3. In order to takethe strain ofi' the screws 3 I shape the lower end of the bars 1 withshoulders 4 engaging in corresponding notches formed in the jaws 2 sothat the downward strain of the jaws is taken up by the shoulders 4. Theupper ends of the bars 1 are curved toward each other so that they maymeet at 5 and so that the under surface of said curved ends forms awedge-shaped recess against which the wedge head may be pressed by thejack. Holes or slots G pass through each of the side bars 1, and a tiebar 7 passes through both of said slots 6. The tie bar 7 has holes inits ends through one of which the straight key S passes and through theother of which the wedge key 9 passes, both of said keys engaging saidbars 1 in similar seats or grooves 10 in their outer sides. A bridgepiece 11 straddles the tie bar 7 and engages the frame from which thebolt is to be drawn on each side of the bolt head and on each side ofthe jaws 2. The wedge head 12 is shaped to substantially fit the curvedupper ends of the bars 1 and to be pressed upward by the jack which isplaced between it and the upper end of the bridge piece 11.

This mechanism is applied as follows:- The two bars 1 are placed withtheir jaws 2 in contact with the bolt head and with their upper ends 5touching each other; then the tie bar 7 is passed through the slots Gand the keys 8 and 9 are inserted therein so that the bars 1 are heldfirmly together; then the wedge head 12 and the bridge piece 11 areinserted in place and the jack placed therebetween. As the jack forcesthe parts 11 and 12 apart the wedge pushes outward on the upper ends ofthe bars 1 and 'therefore forces thejaws 2 tightly into contact with thebolt head and when this motion ceases the further motion of the jackwill force the jaws to pull the bolt out of the frame. The jack which Ihave devised for this purpose comprises a heavy cylinder 2O in which thepiston 21 acts. The piston 21 is provided with a heavy shank 22, adaptedto engage the wedge head 12, said shank 22 being smaller' than thepiston and passing freely through the cover 23 of the cylinder 20, saidcover acting as a guide therefor. A spring 2st is coiled between thecover 23 and the piston 21 to return the piston to the starting point assoon as the pressure is released therefrom. The piston is made tight bymeans of a leather cup 25 which is fastened thereto by a bolt 26pressing on a large washer 27. The washer 27 has a flange extendingaround its circumference. A spring 2S lies within the channel formed bythe flange of the washer' 27 and presses outward on the leather cup 25to prevent air from entering under the piston when the jack is not inuse or when the pressure is being reduced thereunder. A long cylinder29, of much smaller diameter than the cylinder 20, is connected theretobelow the piston 2l by a passage. A plunger or plug is within thecylinder 29 and is free to move longitudinally therein but will notallow any leakage therepast. This plunger comprises a head 80, having abolt or screw-threaded shank extending therefrom, on which are mountedtwo or more leather packing rings 3l separated by washers 32, all ofsaid parts being held together by the nuts on the shank of the head 30.This plunger is not attached to anything but is pressed forward withoutrotation by the end of the operating screw 33, thus keeping the packing31 from wearing out by its being turned in the cylinder 29. The rod 33is screwed through a long nut 34, secured to the end of the cylinder 29,and enters the said cylinder behind the said plunger'. A single turn ofthe rod 33 will cause its end to travel a very short distance in thecylinder 29 and its end will press against the head 30 of the plunger,thus forcing it forward, or will remove the said pressure and thus allowit to be forced backward by the pressure in the cylinder 20 producedbythe spring 24. Oil is placed in the cylinders 2O and 29 between theplunger 30 and the piston 2l so that the motion of the plunger causes asmaller but more powerful motion of the piston. The rod 33 is rotatedbyv hand or by any suitable power. The jack may be used for pushing abolt out of a hole in some cases, without the gripping means abovedescribed.

Having described my invention, what I claim is l. In a device of theclass described, the

combination of means for engaging the bolt to be extracted; means forengaging the frame from which'the bolt is to be extracted; a cylindercontaining a fluid and adapted to act on the frame engaging means; apiston therein, said piston having a shank extending through thecylinder and adapted to act on the bolt engaging means; a leather cupsecured to said piston; a spring pressing outward on said cup to insurea tight contact between the leather cup and the cylinder walls at allti1nes;a smaller cylinder containing a fluid and connected to said lirstcylinder below the piston; a plunger in said smaller cylinder; and meanswhereby said plunger may be moved whereby reaction is exerted betweenthe large cylinder andthe piston therein to extract the bolt. i i i 2.In a device of the class described, the combination of means forengagingthe bolt to be extracted; means for engaging the frame from which thebolt is to be extracted; acylinder containing a Huid and adapted to acton the frameengaging means; a piston therein, said piston having a shankextending through the cylinder and adaptedto act on the bolt engagingmeans; a smaller cylinder containing a fluid and connected to.

said first cylinder below the piston; a free plunger in said smallercylinder; and a screwrod adapted to press against said plunger to moveit in said smaller cylinder whereby reaction is exerted between thelarger cylinder and the piston therein to extract the bolt.

JOHN A. MAGNUSSON. Witnesses:

P. R. TANZY, GEO. Gr.' GOODMAN.

Copies of this patent may be obtained for five cents each, byaddressing' the Commissioner of Patents,

Washington, D. C.

